Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 339: | \[{3^{339}-1\over2}\] | 13 × 227 × 1583 × 2172539 × 51017244973<11> × 283274887324515433<18> × 526256453012063980796131127321354599535039<42> × 3593644700262187007115600246295631389617434711376028464247367822157434667812509<79> |